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Health Hazard Evaluations (HHEs)

Each month we will update this page to highlight newly released final reports and information on new and emerging hazards we are evaluating. Check back often to see what we are up to!

What's New

  • Evaluation of Diesel Exhaust Exposure at Two Fire Stations
    Finding low levels of diesel exhaust in all areas of the fire stations, HHE Program investigators confirmed that air flowed from the apparatus bay into the living quarters; opposite of what is preferred. We recommended improving the ventilation systems at both stations and installing diesel control systems to decrease the amount of exhaust in the apparatus bay. To read the full report go to
  • Ventilation Recommendations Provided to an Indoor Waterpark Resort
    HHE Program investigators found that work-related eye and respiratory symptoms were about 5 times more common among employees who worked in the waterpark than other parts of the resort. The ventilation systems were not operating properly and did not meet current standards and guidelines. We recommended the waterpark improve the ventilation systems to ensure enough air movement, and proper dilution and removal of air contaminants. To read the full report go to
  • New HHE Video Series Shows What Happens on a Site Visit
    Ever wonder what happens when the Health Hazard Evaluation team visits a workplace? Watch 3 new HHE videos to get a glimpse into our activities. Each video shows a different type of testing or sampling conducted in a workplace and reactions from the employer and employees.
  • 2015 Health Hazard Evaluation Program Annual Report
    The NIOSH Health Hazard Evaluation (HHE) Program is pleased to share its 2015 annual report. Our report includes summaries of projects that were interesting and other highlights of our year. We hope the report stimulates conversations about who the HHE Program is and how we make a difference for the health and safety of employees throughout the United States. A link to the annual report is available here: